Obituaries for William Morgan, former Director of Yerkes Observatory and a pioneer in understanding stellar populations, will appear in Physics Today, Pub. Astron. Soc. Pacific, and Biographical Memoirs of the Natl. Acad. Sciences.
Additional links:
http://dx.doi.org/10.1063/1.2808763
http://adsabs.harvard.edu/abs/1995PASP..107..507G
http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1995PASP..107..507G&%3Bdata_type=PDF_HIGH&%3Bwhole_paper=YES&%3Btype=PRINTER&%3Bfiletype=.pdf